1. 1, gas water heaters are classified according to air supply and exhaust modes:
Direct-row gas water heater: the oxygen needed for combustion is taken indoors, and the production and sales have been banned in China at present.
Flue gas water heater: the technology is mature and the price is low, but the combustion intensity is low and the water heater is large.
Forced exhaust water heater: the waste gas generated after combustion is forced out of the room by the internal fan through the flue, which has good safety performance.
Balanced gas water heater: The oxygen required for the operation of the water heater is supplied from the outside through the outer flue, and the flue gas generated after combustion is discharged from the inner flue, which neither consumes nor pollutes the indoor air.
Condensing gas water heater: the thermal efficiency is higher, reaching above 96%. At the same time, neutralizer is used to treat the discharged condensate harmlessly, which truly realizes energy saving and environmental protection.
1.2, gas source classification of gas water heater:
Natural gas: the main component is methane, which is transported by pipeline. It is the most widely used combustible gas at present, and there are many corresponding products.
Liquefied petroleum gas: mostly canned, with high thermal efficiency, high price and great danger. Few products use this gas source.
Gas: The main components are hydrogen, methane and carbon monoxide, with low thermal efficiency, and few products use this gas source.
1.3, other classification methods of gas water heaters
Classification by installation location: indoor installation and outdoor installation;
According to the control mode, it is divided into front water heater and rear water heater;
2. Terminology related to gas water heaters
2. 1, gas water heater capacity
The capacity of gas water heater is in liters. The capacity of gas water heater is not the size of water tank, but the number of liters represents the water output per minute when the temperature rises by 25℃. Because the gas water heater belongs to the ready-to-use type, it has nothing to do with the population at home, but the water consumption point of hot water is related to its liter size.
10- 13 liters: one kitchen and one bathroom; 16 liter: one kitchen and two bathrooms; 20 liters: duplex or small villa; 24 liters and above: large villas or small clubs;
2.2, gas water heater main technical points:
Double adjustment of water and gas: according to the different inlet and outlet temperatures, automatically determine the number of fire rows, then automatically analyze the required gas and oxygen according to the number of fire rows, and then give instructions to the gas solenoid valve and the water solenoid valve to accurately achieve the constant temperature effect.
CO protection system: real-time and accurate monitoring of the concentration of CO in indoor air. Once it is found that the concentration exceeds the set safe concentration, the system will automatically give an audible and visual alarm, automatically cut off the air source at the same time, and quickly start the fan to exhaust air to ensure the safety of users.
Intelligent wind pressure compensation: the combustion of gas water heater will be affected by outdoor wind pressure. Intelligent wind pressure compensation technology can intelligently sense the change of wind pressure, and automatically compensate the wind pressure of the combustion chamber when the outdoor wind pressure becomes larger, thus ensuring safe combustion.
Intelligent constant temperature: During the use of gas water heater, it can automatically adjust the size of combustion firepower and water inflow in real time according to the changes of air pressure, wind pressure and water pressure, so that the outlet water temperature is always constant.
Zero cold water: the water in the hot water pipe is always kept at a set temperature through water circulation technology, and users can enjoy constant temperature and comfortable hot water by unscrewing the valve.
2.3, accurate constant temperature gas water heater
This kind of gas water heater is basically unaffected by the instability of water pressure and air pressure, and the difference between the initial set temperature and the outlet temperature is less than 0.5 degrees, which makes the use process more comfortable and saves water and gas.
2.4, gas water heater anti-burning function
In order to prevent empty burning, gas water heaters are set with ignition water pressure, which is generally 10-30kpa, below which ignition will not start. The water pressure in the city will meet the water pressure required by gas water heaters, and high-rise residents can ask the property about the water pressure.